Dorian Company Produces and Sells a Single Product

Dorian Company produces and sells a single product. The product sells for $60 per unit and has a contribution margin ratio of 40%. The company's monthly fixed expenses are $28,800.
-If Dorian Company desires a monthly net operating income equal to 10% of sales, monthly sales will have to be:

A) $90,000
B) $45,600
C) $120,000
D) $96,000